2 86 The Ohio Naturalist. [Vol. VIII, No. 5, 



Fig. o. A pair of daughter nuclei remaining unusually close together 

 (one cut in sectioning) ; rays of the centrosome prominent and granular, 

 bending around the nuclear vacuole on the side opposite the centrosotne, 

 but not yet met to complete the membrane. 



Fig. 6. A cone of tapering astral rays enfolding the nuclear cavity 

 and bending around beyond it ; prominent granules on the nuclear mem- 

 brane. 



Fig. 7. Muclear membrane almost complete by the meeting of the 

 rays. 



Fig. 8. Nucleus showing a banded condition similar to a spirem; the 

 bands probably derived from the four chromosomes. 



Fig. 9. A nucleus with three distinct asters connected by heavy 

 radiations. 



Fig. 10. A nucleus in a spirem-like condition with two centrosomes 

 forming, with their racHations, a figure like an amphiaster. 



Fig. 11. A nucleus showing the gradual genesis of the nuclear wall 

 on the side next the centrosome; also a large deep-staining granule sur- 

 rounded by a vacuole. 



Fig. 12. An aster with a large rather diffuse centre and numerous 

 very tine rays; nuclear membrane complete but still associated with the 

 rays. On the membrane of both this and the portion of the sister nucleus 

 are conspicuous granules lying in different positions with respect to the 

 nuclear wall. 



Fig. 13. Centrosome more diffuse than in fig. 12; nuclear membrane 

 disturbed by knife. 



Fig. 14. Nucleus in spirem sage with a large mass of dense cytoplasna 

 at one side which is interpreted as the end stage of the centrosome. ' 



Just as this number goes to press telegrams bring the sad in- 

 telligence of the death of Professor W. A. Kellerman in Guate- 

 mala. Professor Kellerman was one of the most active in the 

 founding of the Naturalist, a member of its advisory board since 

 the beginning, and its volumes include a large number of con- 

 tributions from his facile pen. He was a most enthusiastic and 

 untiring worker and the rich collections which he has brought 

 together, representing the flora of home and foreign countries 

 will be a y)ermanent evidence of his devotion to science. 



Only meager information concerning his illness is at hand, but 

 we learn that interment will be made in Guatemala, in the region 

 which has been the scene of his latest work and which he had 

 explored with a delight born of love for its beauty of scenery 

 and wealth of life. 



We must reserve for a later num1)er fuller details, and the 

 appreciations merited by his work. H. O. 



